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Subject[PATCH v2 01/12] spi: dt-bindings: introduce FIFO depth properties
Date
There are SPI IPs that can be configured by the integrator with a
specific FIFO depth depending on the system's capabilities. For example,
the samsung USI SPI IP can be configured by the integrator with a TX/RX
FIFO from 8 byte to 256 bytes.

Introduce the ``fifo-depth`` property for such instances of IPs where the
same FIFO depth is used for both RX and TX. Introduce ``rx-fifo-depth``
and ``tx-fifo-depth`` properties for cases where the RX FIFO depth is
different from the TX FIFO depth.

Make the dedicated RX/TX properties dependent on each other and mutual
exclusive with the other.

Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
---
.../bindings/spi/spi-controller.yaml | 27 +++++++++++++++++++
1 file changed, 27 insertions(+)

diff --git a/Documentation/devicetree/bindings/spi/spi-controller.yaml b/Documentation/devicetree/bindings/spi/spi-controller.yaml
index 524f6fe8c27b..add39884d226 100644
--- a/Documentation/devicetree/bindings/spi/spi-controller.yaml
+++ b/Documentation/devicetree/bindings/spi/spi-controller.yaml
@@ -69,6 +69,21 @@ properties:
Should be generally avoided and be replaced by
spi-cs-high + ACTIVE_HIGH.

+ fifo-depth:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Size of the RX and TX data FIFOs in bytes.
+
+ rx-fifo-depth:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Size of the RX data FIFO in bytes.
+
+ tx-fifo-depth:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Size of the TX data FIFO in bytes.
+
num-cs:
$ref: /schemas/types.yaml#/definitions/uint32
description:
@@ -116,6 +131,10 @@ patternProperties:
- compatible
- reg

+dependencies:
+ rx-fifo-depth: [ tx-fifo-depth ]
+ tx-fifo-depth: [ rx-fifo-depth ]
+
allOf:
- if:
not:
@@ -129,6 +148,14 @@ allOf:
properties:
"#address-cells":
const: 0
+ - not:
+ required:
+ - fifo-depth
+ - rx-fifo-depth
+ - not:
+ required:
+ - fifo-depth
+ - tx-fifo-depth

additionalProperties: true

--
2.43.0.687.g38aa6559b0-goog

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